Also see http://ottawa.ca/en/residents/transportation-and-parking/road-and-sidewalk-maintenance/spring-maintenance-and-flood-control#spring-clean-street-sweeping, particularly for concentrated street cleaning locations and schedules.
From the city’s winter parking alerts newsletter:
Street sweeping operations now in effect
The City of Ottawa’s winter overnight parking restrictions are now completed for the 2016-2017 season. The City would like to thank you for your cooperation in making our streets safer throughout the winter season.
On Sunday, April 9 City of Ottawa crews will begin the annual city-wide sweeping of streets and sidewalks, including both daytime and night-time operations. These operations are necessary to remove debris, dust and sand that accumulated over the winter months.
In addition to the city-wide sweeping operations, the City completes concentrated sweeping operations in neighbourhoods that support continuous on-street parking.
During concentrated street sweeping debris from boulevards, sidewalks and medians is swept or flushed onto the roadway, where a vacuum truck then picks up the majority of grit, debris, small particles and dust. This operation may be repeated several times to ensure a clean surface. If vehicles are parked on the street, the un-swept area is noted and crews must then return to sweep that portion. Your patience and co-operation to keep vehicles off the streets during this period is appreciated.
Concentrated street sweeping will commence Sunday, April 9 through to Friday, April 14, 2017; subject to weather conditions. This year, concentrated street sweeping t will take place during daytime operations only and will be performed in the following areas: Downtown Core, Vanier, New Edinburgh, Sandy Hill, Glebe, Centretown, West Centretown, By-Ward Market, Lowertown, Ottawa East, Ottawa South and sections of Overbrook.